hi guys.....the GXE brougham edition i jus bought has few problems with its digi speedo meter....1) speedo meter goes off and comes on by it self while driving...2) when i push the brake pedal warning lights on speedo meter like seat belt, fuel warning and all other lights start to dim and bright dim and bright till i release the pedal everything comes bak to normal...3) i have a spare digi speedo meter and i installed that and diming lights problem stays but speedo meter goes on and off while driving PROBLEM goes away...4) when i turn the ignition on speed on my speedo meter is 0km but when i start the car it shows around 40km like car is driving but i m not its parked.....sorry but i m having all dose problems and i m phsically dealing with digi speedo meter first time...thanks in advance guys

 

so, does the 0/40km thing do it with both gauges?

swapping out the gauges tells you where the problems aren't. if the problem is in the gauges, the problem will leave.
just to make sure I read it right, the 2nd speedo does not turn on and off, but works properly. (does it go to zero-km, or the gauge lights go out?)
both gauges dim when brakes are applied ( I read it and saw, dims-and-returns-and-dims-and-returns, as a cycle, is that right?)

 

so, does the 0/40km thing do it with both gauges?---> i can't say anything cuz the car's speedo gauges doesnt come on wen i start the car they come on after u start driving and drive for a while then they come and goes off...and the one i installed after, guages come on right away wen i start the car and everything is normal but it shows 40km in parked car...

both gauges dim when brakes are applied ( I read it and saw, dims-and-returns-and-dims-and-returns, as a cycle, is that right?) ---> yes u r right...but guages doesnt dim and returns only side lights are like seat belt,fuel warning,battery,and those side lights... leme go make a video of that and its night perfect BRB...

 

here i made a crappiest video ever but still can see....ok first i turn on the ignition and speedo meter comes on in normal mode then i start the car pay attention dere speed goes around 40km then i apply brakes and those lights on the right side and a light on the left side bottom left corner is dancing...i didnt release the brake pedal...cuz obviously they come to normal den steady...

http://www.youtube.com/watch?v=AHgaSzPcSOQ

heres da video..

edit: i m gonna buy a digital camera soon...

 

i fixed it...

 

please leave details.
if somebody else has the problems, they can find this thread, and have an idea on how to fix it.

 

The speed sensor is to blame for the false reading when parked. It does it when the tranny is cold and goes away in about 10 minutes after the trans has warmed up. Mine does the same thing on cold starts if the temp is below about 45 degrees.

As far as the flickering bulbs go, most likely there is a weak connection somewhere in that illumination circuit. You said you tried 2 clusters and if they both did the same thing, you can pretty much rule out loose bulbs or wiring within the cluster. Check the harness, check your alternator, check your grounds, check tail wiring.

 

hectic is right....i changed speed sensor and it is fixed...how i found out about dat ? cuz wen i was having problem with speed going around 40\km wen i start the car, it was a cold night and wen in afternoon i started the car and speed was around 5 or 10 km...so it was obvious that the day is HOT and tranny isnt as cold as night and speed sensor was the problem ..so i changed the sensor and it is fixed now.....and about speedo meter lights diming while applying brakes was the problem in tail lights wiring they were attached and melted and corroded.....or u can say there was a short circuit....i fixed wiring and now wen i apply brakes theres no diming in speedo meter....wierd eh? well ya it fixed it...

 

i m amazed about one thing that ECU never showed any trouble code for SPEED SENSOR? i have a bad Coolant Temp Sensor and ECU showing code for it but why not for Speed Sensor? and can i use VE Coolant temp sensor in VG? they look same to me.....

 

so your actual brakelights were messing up too weren't they? i've melted brake wiring before... the contacts on a bulb flattened and spread, combined a few circuits, and kept blowing the fuse.

 

yaa they were....i had go to junkyard to get the new brakelights assembly for passenger side cuz bulbs were all over the place and melted everything there....they made holes in plastic